Lo 3 The student is able to select and apply mathematical relationships to mass data in order to justify a claim regarding the identify and/or estimated purity of a substance. (Sec 5, 7) lo 3

AP Learning Objectives, Margin Notes and References

• Learning Objectives
• LO 2.6 The student can apply mathematical relationships or estimation to determine macroscopic variables for ideal gases.
• LO 3.4 The student is able to relate quantities (measured mass of substances, volumes of solutions, or volumes and pressures of gases) to identify stoichiometric relationships for a reaction, including situations involving limiting reactants and situations in which the reaction has not gone to completion.

Molar Volume of an Ideal Gas

• For 1 mole of an ideal gas at 0°C and 1 atm, the volume of the gas is 22.42 L.
• STP = standard temperature and pressure
• 0°C and 1 atm
• Therefore, the molar volume is 22.42 L at STP.

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A sample of oxygen gas has a volume of 2.50 L at STP. How many grams of O2 are present?

• A sample of oxygen gas has a volume of 2.50 L at STP. How many grams of O2 are present?
• 3.57 g

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• EXERCISE!